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Fig. 3. Part of the side of the sac around which is formed 

 a layer of leucocytes, ^^/i. h. the cast larval skin 

 from the foregoing moult, s, 1 as in fig. 1. 



Fig. 4. Part of the bottom of the sac with surrounding 

 leucocytes, ^''^k. The letters as in fig. 1. 



Fig. 5. Longitudinal section of the bottom of the sac. ^^/i. 

 The letters as in fig. 1. 



Fig. 6. Transverse section of a H^ponomeuta-HrxQ. with 

 a half-grown Pkjchomyia-\diV\di. ^^/i. The letters 

 as in fig. 1. oci,. the cuticula of the parasite. 



Fig. 7. Transverse section of a Ht/ponomeiita-lnrva. with a 

 fullgrown parasite. The letters as in fig. 1 and 6. ^^/i. 



Viviania cinerea Fall. 



Fig. 8. Section through a trachea of Carabus violaceus to 

 which a F/ymwm-larva is attached. *^/i. h. the cast 

 larval skin from the foregoing moult, k. the funnel. 



Fig. 9. Part of a trachea of Carabus violaceus and the 

 basis of the funnel. "^^Ii. tc. the chitinous layer of 

 the trachea; tp. the epithelium of the trachea. 



Ocyptera. brassicaria F. 

 Fig. 10. Longitudinal section of the chitinous funnel enclo- 

 sing the posterior end of the larva, -"/i. k. as in fig. 8. 



PI. IL 



Ptychomyia selecta Meig. 

 Fig. 11. 1. stage. Pharyngeal skeleton, -^^/i. p. the plate below 

 the skeleton: ns. the lower and es. the 

 upper pharyngeal plates; t. the median 

 tooth. 



- 12. - - Posterior spiracles. ^^°/i. f. The atrium 



(»Filzkammer«'). 



- 13. - - Pharyngeal skeleton. ^-Vi. m. hooks; ns. 



0s. as in fig. IL 



